tree 98d83a6f66f113c4717cff4006a620dc7d3b5727
parent 57097130d5e4880e39ce8f63eba6f11d7c51e94c
author Matt DeVillier <matt.devillier@gmail.com> 1653004987 -0500
committer Paul Fagerburg <pfagerburg@chromium.org> 1654004619 +0000

dev/i2c_bus: Add declaration, implementation of i2c_dev_detect()

This patch adds the I2C equivalent of an SMBus quick write to an I2C
device, which is used by some I2C drivers as a way to probe the
existence (or absence) of a certain device on the bus, based on
whether or not a 0-byte write to an I2C address is ACKed or NACKed.

i2c_dev_detect() is implemented using the existing i2c bus ops transfer()
function, so no further work is needed for existing controller drivers
to utilize this functionality.

Change-Id: I9b22bdc0343c846b235339f85d9f70b20f0f2bdd
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64537
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@tutanota.com>